furnace not blowing cold air

With the AUTO setting chosen, your furnace should only run the fan during a heating cycle and not push cold air through your vents in between. Somebody else is adjusting the thermostat . This can cause your furnace to lock down for safety. It's also possible that the furnace's pilot light isn't well shielded. If you have an oil-fired furnace, you may be out of fuel. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. In such a case, your heater is not lighting the fuel, as a result of which it cannot heat your home. Here are some possible reasons your furnace is blowing cold air: The furnace is overheating And if it's the dead of Winter, this can be a serious problem that needs immediate attention. Do this: Turn off your furnace at the thermostat This is due to the programmed settings of a furnace system, which gauge the temperature within a living quarter and only disperse heat until the preset temperature is reached. Once its lit, if it doesn’t stay lit, it may need some routine maintenance from an HVAC professional. You can easily fix this problem by thawing the condensate, but you'll need to take long term measures to prevent the issue from happening again. When it is chilly, having a heater that is not working is a major cause of concern. 2. Icy cold air blowing from your vents on an already cold night is a dreadful experience. 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Then, use a pipe cleaner or other small brush to remove any clogs within the supply tube. It’s possible your furnace overheated. Outside of a heating cycle, the furnace could be blowing cold air because of a settings mistake. If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. At first, you may think the furnace will stop blowing cold air on its own, but after several minutes you realize that something is wrong and that the furnace is not going to fix itself. Cold air trapped inside will need to be expelled before the hot air can take its place! The blower motor itself does not … The oil from your fingers can cause permanent damage to the part. Check the Service Door It is possible—particularly if you’ve recently changed your furnace filter or done other maintenance—that the door to your furnace has been left open or closed improperly. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. After checking that your fuel level is adequate and your filter is clean, the next area to check is the flame sensor. If it stays lit, you should be back in business. When your furnace is blowing cold air your warm and inviting home can turn into an icebox in a matter of hours! While in some cases, you’ll need a professional the fix the pump. However, if that line gets blocked, water backs up into the furnace, causing an overflow kill switch to shut down the furnace to prevent water damage. Excessive heat or exposure to water can damage the circuit board, which can cause your furnace to lose some or all of its functionality. The cold air you feel is from the fan blowing it in because it is always running. An HSI or Hot Surface Ignitor is the most popular way to ignite a pilotless furnace. Your furnace may or may not be blowing cold air if your ductwork is leaking, but you may have noticed it more challenging to keep one or two rooms warm. If this doesn't resolve your cold air problem it could be the themostat itself, but before calling a professional, we recommend trying the other troubleshooting suggestions first. if it is, clean it to allow gas to come through. heater is not lighting the fuel, as a result of which it cannot heat your home, Ducane Furnace Reviews [Models and Prices]. Try changing the batteries. If the flame goes out, then all is not well. Use care not to touch an HSI when troubleshooting or installing a new one. When high-efficiency furnaces run, they create water (condensate), which is emptied out a drain line. Use a wrench or pliers to remove the pilot tube. Alternatively, you can call your local utility company or an HVAC technician to make sure it is lit safely. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. If you have a high-efficiency furnace and you see water pooling around the furnace. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. 1) Change the furnace’s air filter if it’s dirty You may have a thermocouple-related problem, meaning the component needs adjusting or replacing. Changing your furnace filter is an important part of caring for your HVAC system and it should be done, at minimum, every three months. Have an expert inspect your ducts along with the furnace. Last update on 2020-12-29 / Affiliate links / Images from Amazon Product Advertising API. The pump a thermocouple-related problem, meaning the component needs adjusting or replacing hot then cold air is your. 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